8 BULLETIN 1065, U. S. DEPARTMENT OF AGRICULTURE. 



SPECIAL POINTS TO OBSERVE IN MAKING CORRECT WEIGHT- 

 PER-BUSHEL TESTS. 



1. Use an accurate quart-size weight-per-bushel testing apparatus. 



2. Fill the kettle from a hopper. 



3. The opening at bottom of hopper must be round and exactly 1| 

 inches in diameter. 



4. The bottom of the hopper must be held exactly 2 inches above 

 the center of the kettle. 



5. Mark the hopper on the inside at a point where it will hold just 

 enough grain to cause an overflow over all sides of the kettle. 



6. Use the same volume of grain for each test. 



7. Use a stroker made of hardwood, with smooth rounded edges, 

 12 inches long, f inch thick, and If inches broad. 



8. Place the stroker on the edge of the kettle lightly without jarring 

 the kettle. 



9. Hold the stroker on the kettle with its sides in a vertical position. 



10. Stroke the grain from the kettle with three full-length zigzag- 

 motions of the stroker. 



11. Make the stroke clean all the way across the kettle. 



12. Have the kettle rest on a firm base. 



13. Do not jar the kettle before or during the stroking operation. 



14. If the top of the kettle is rough, smooth down the roughness 

 with a rounded metal bar but do not use a file. 



15. Make the test immediately after the sample has been brought to 

 the inspection room, office, or laboratory, to prevent the grain from 

 drying out with consequent change in test weight. 



16. In the case of wheat and other grains for which the standards 

 provide a specification for " dockage," make the test after the dockage 

 has been removed. 



17. The quart kettle must have a capacity of exactly 67.2 cubic 

 inches. 



18. Use a beam which is both accurately graduated and sensitive to 

 -^ pound per bushel. 



19. Have the grain tester tested periodically for — 



(a) Accuracy of kettle capacity ; 



(b) Accuracy of beam readings ; and 



(c) Sensitiveness of beam. 



Any office of Federal grain supervision will be glad to test any 

 apparatus for accuracy, or arrange to have it tested free of charge. 



METHOD OF DETERMINING ACCURACY OF TEST KETTLE^ 



Apparatus required: (See fig. 6.) 



1. Kettle to be tested. 



2. Slicker plate, plate glass 5 inches in diameter. 



